Difference between 2*3 and 3*2

Boy: I got an F in Arithmetic.

Dad: Why ?

Boy: The Teacher asked 'How much is 2 * 3' ?

and I said it is '6'.

Dad: But that's right only na..

Boy: Then she asked me 'How much is 3 * 2' ?

Dad: What's the XXXXX difference ?

Boy: That's exactly what I said!


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